Custom Seamless Workout Shirts & Crop Tops Manufacturer

As a specialist seamless tops manufacturer, we create body-contouring seamless workout shirts, including on-trend long sleeve and cropped styles. Partner with us for your private label collection.

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Seamless Activewear

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Seamless Crop & Fitted Tops

Flattering Fits, Functional Comfort

On-Trend Cropped Silhouettes

Body-Contouring Seamless

Our seamless knitting technology creates a smooth, body-hugging fit that moves with you and flatters your silhouette.

All-Day Comfort & Mobility

Chafe-Free for Active Use

The elimination of traditional seams means no chafing or irritation, providing ultimate comfort during any workout.

Performance-Ready Fabrics

Breathable Moisture-Wicking

Engineered with breathable knit patterns and moisture-wicking yarns to keep you cool and dry.

On-Trend Crop & Fitted Styles

On-Trend Crop & Fitted Styles

We specialize in the most popular silhouettes, including seamless cropped tees and classic fitted seamless tops.

In-Depth Customization: Create Your Perfect Custom Seamless Top

Your brand is unique, and your products should be too. Explore the possibilities below.

Fabric & Materials

Select from our extensive library of premium performance fabrics, or work with us to develop a custom material.
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Fit & Construction

Define the core structure of your sports garment, from the silhouette and fit to the seams and construction techniques.
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Features & Functionality

Incorporate functional elements that add value and meet your customers’ specific needs.
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Color & Finishing

Choose from a limitless color palette with Pantone® matching, and explore various finishes and treatments.
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Branding & Logos

Apply your brand identity with a range of high-quality techniques for a professional finish.
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Start Your Custom Seamless Crop & Fitted Tops in 4 Simple Steps

Our streamlined process makes bringing your custom activewear line to life straightforward and efficient.
Inquiry & Consultation

Inquiry & Consultation

Design & Sampling

Design & Sampling

Bulk Production & QC

Bulk Production & QC

Shipping & Delivery

Shipping & Delivery

From Fabric to Final Sportwear Garment

We combine meticulous planning with advanced technology and strict quality control at every stage of production.

Your Premier Manufacturer for Custom Seamless Workout Shirts

As a leading manufacturer of seamless workout shirts, Sansansun specializes in technical and stylish tops. Our expertise lies in creating seamless gym shirts, with a focus on popular designs like the seamless long sleeve top workout style and the on-trend seamless cropped tee. We utilize advanced knitting to produce fitted seamless tops that offer a superior, body-contouring fit and chafe-free comfort.

We are the ideal partner for brands looking to offer complete seamless collections. Our services include creating fully custom seamless tops for your private label line and providing flexible wholesale seamless tops programs. As an experienced seamless factory, we are committed to delivering the innovative designs and high-quality construction your customers expect.
Your Premier Custom & Wholesale Yoga Pants Manufacturer

Your Advantage in the Conscious Activewear Market

Flexible MOQ & Sourcing

Flexible MOQ & Sourcing

From 30-piece wholesale orders for market testing to fully custom production runs, our flexible MOQ policy is designed to support your brand's growth.

Scale & Factory-Direct Pricing

Scale & Factory-Direct Pricing

Leverage our 600,000+ piece monthly capacity. Our scale and factory-direct model ensure you receive competitive pricing, maximizing your profit margins.

One-Stop Solution

One-Stop Solution

Go beyond manufacturing. Our solution includes precision strategic consulting and access to 800+ new annual styles for a faster, smarter launch.

Quality Guarantee

Quality Guarantee

Your products are backed by our rigorous multi-stage QC process, from incoming fabric inspection to a 100% final garment check.

Ready to Launch Your Next Best-Selling Collection?

Work with a partner who brings design, speed, and reliability together. We’ve helped 200+ growing brands launch faster, scale smarter, and win in their markets. You could be next.